Questions about verbs in their basic (unmarked) forms, such as “be”, “do”, “have”, or “sit”, sometimes introduced by the particle “to” and other times used by itself.

The infinitive is the untensed citation form of a verb. Sometimes it is used with a prefix to particle, and sometimes it is just a :

  • I was happy to see you.
  • To see you is my greatest desire.
  • They made me see you.
  • I know that I should see you.